On Fri, Jul 23, 2010 at 2:27 PM, KvS <keesvansch...@gmail.com> wrote: > Dear all, > > I'm sorry if this is a 'utfs' question, but I couldn't really find a > clear answer. I would like to do some numerical operations on a Sage > function (/expression) provided by the user (i.e. typed in the > notebook). Ideally I would like to have this function available as a > Cython function to perform these operations (assuming say the input is > a composition of only 'elementary' functions). So say the user enters > 'f(x)=x^2' I would like to have a Cython function like > > cdef f_ cython(double x): > return x**2 > > so that I can run other Cython functions that evaluate f_cython (a > lot). Is there a standard way to do something like this? If not, I > guess I could try producing the code for the Cython function > definition as a string and then call eval(...) on it or something like > that? What would be the best way, keeping an eye on optimisation for > speed? > > Many thanks, Kees >
You might look at fast_callable and fast_float, which are in Sage. Often Cython only beats them by a factor of 2, and they are very easy to use. William -- William Stein Professor of Mathematics University of Washington http://wstein.org -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
